There are a few different ways you can make your own chemical cold pack. Here is how to make a cold pack using sodium acetate or hot ice.
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Mueller reusable cold / hot pack 6 x 9, pain management / hot & cold. - Atlantic Healthcare Products
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Buy Ice Cool Pack, Sealed & leak proof Pack, Hot & Cold Gel Pack, Multipurpose Use Hot Cold Pack Pads, Pack of 4, 400 ML each Online at Best Prices in India - JioMart.
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Hot/Cold Packs Water Re-usable Feze Microwave Boiling Soothing Heat Pads Water Cool HeatInsulated Ice Pack Convenient Bag